Biology Module 1 (NOT COMPLETED)

Types of Microscopes

Magnification- the degree to which the size of the image is larger than the object itself Resolution-the degree to which it is possible to disinguish between two objects that are very close together (the higher the resolution the greater detail you can see).

These properties come from the way the charges are distributed across molecule.

If phospholipid molecules are mixed with water, they form a layer at the water surface with the phosphate head sticking into the water and the lipid tail sticking out.

If surrounded by water a bilayer will form, phosphate heads on each side will stick into the water and the tails will point towards each other, effectively held away from the water molecules. The hydrophilic heads cannot easily pass through the hydrophobic region in the middle which gives the bilayer some stability even though the molecules are not bonded together.